https://en.wikipedia.org/wiki/Frost_(temperature)

Frost or freezing occurs when the temperature of air falls below the freezing point of water This is usually measured at the height of 1.2 m above the ground ...

https://www.scientificamerican.com/article/all-50-u-s-states-feeling-freezing-temperatures1/

NEW YORK (Reuters) - Temperatures in all 50 U.S. states dipped to freezing or below on Tuesday as an unseasonably cold blast of weather moved across the ...

https://www.ldoceonline.com/dictionary/above-below-freezing

above/below freezing• It should show frost when outside temperatures are below freezing.• It roots out vines, truffles for lemon trees painfully heated by charcoal ...

https://www.thespruce.com/how-to-protect-your-home-from-freezing-temperatures-1388721

Apr 23, 2019 ... Take these steps to protect your home from freezing temperatures, and ... faucets to a slow drip whenever temperatures dip below freezing, for ...

https://www.cnn.com/2019/01/28/us/winter-weather-monday-wxc/index.html

Jan 29, 2019 ... 75% of the US population will suffer below-freezing temps this week .... US population -- will endure below-freezing temperatures this week.

https://www.wusa9.com/article/news/tips-for-driving-in-sub-zero-temperatures/65-6dbf295a-6e6c-4b4b-aa15-a8dab7878170

Jan 30, 2019 ... BETHESDA, Md. — With the temperatures dropping below freezing in the area, it's important to know how to take special care of your car in this ...

https://www.livescience.com/6008-person-freeze-death.html

Jan 30, 2019 ... Extremely cold temperatures this week might have you wondering what happens to your body at these temperatures, and could you really freeze to death? ... Below 70 F (21 C), you are said to have profound hypothermia and ...

https://wattsupwiththat.com/2019/01/29/polar-vortex-will-have-nearly-90-percent-of-us-below-freezing/

Jan 29, 2019 ... Nearly 90 percent of the continental U.S. will experience below-freezing temperatures over the next five days as Arctic air moves south, ...

https://www.weather.gov/source/zhu/ZHU_Training_Page/winter_stuff/winter_wx/winter_wx.html

The surface temperature is 25 °F (-4 °C ) and increases with height before decreasing. However, since the temperature remains below freezing any precipitation ...

https://science.howstuffworks.com/nature/climate-weather/atmospheric/question302.htm

Precipitation can vary from rain to snow when the temperature is below freezing. Learn about precipitation.